This map design is highly reminiscent of SBB line maps
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SBB? It looks like the Tube Map to me
I guess you're right. It used to look more similar but not quite anymore. They all look similar to me though.
This is the current version of the SBB. There's also an interactive version.
I'm under the impression that pretty much all railway maps are based on, or developed from, the style of London Underground (also known as "The Tube") maps from the 1930s onwards - so they all look kind of similar, because the designs all grew and developed from the same starting point.
Odd that Estacio de França is now the terminus only of lines from the opposite direction - but it makes sense to run all across the centre.